PartsReadCloser lost the reader

[zengxiaobai]

getContents function:

     if index < len(availableChunks) {
		chunkFile, _ := getSliceChunkFile(c, availableChunks[index])
		if chunkFile != nil {
			if err := checkChunkSize(c, chunkFile, idx); err != nil {
				_ = chunkFile.Close()
				_ = c.bucket.Discard(context.Background(), c.id)
				return nil, 0, err
			}

			// Identify an anchor block and synchronize any missing blocks prior to the current index.
			toByte := min(c.md.Size-1, uint64(availableChunks[index]*uint32(partSize))-1)

			// Request is automatically cloned by getUpstreamReader
			reader, err := c.getUpstreamReader(fromByte, toByte, true)
			if err != nil {
				_ = chunkFile.Close()
				return nil, 0, err
			}

			return iobuf.PartsReadCloser(reader, chunkFile), int(availableChunks[index]-reqChunks[from]) + 1, nil
		}
	}

at
return iobuf.PartsReadCloser(reader, chunkFile), int(availableChunks[index]-reqChunks[from]) + 1, nil

the reader is passed to closer, so when first file chunk is removed, the resp body cannot read from uptream reader, then chunk file 。But only read from chunkfile .
iobuf.PartsReadCloser(reader, chunkFile), int(availableChunks[index]-reqChunks[from]) + 1, nil

[sendya]

fix at : https://github.com/omalloc/tavern/pull/50/changes#diff-8a1e239d89e1cf8de069c991dc73ff3c90d7e79312012282a8c557a0997f58b4R212